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The advanced monitoring capabilities of Exchange are also disabled, due to disabling Microsoft Exchange Managed Availability services. This may result in stale address book results in some scenarios and configurations.

b) The Offline Address Book / OAB will be unavailable, including downloads of the Offline Address Book by Outlook clients.

A better option would have been to use the Microsoft Exchange On-Premises Mitigation Tool, The issues I have with the current mitigations implemented via ExchangeMitigations.ps1 are: a) the Exchange Control Panel is disabled, and that also disables the ability of users to access their full set of Outlook WEB Access options, including some of their email settings, lists of phones that have been registered with their email accounts, etc. However, the mitigation script I employed was in hindsight not the best option I could have utilized. Hi Kotteeswaran, Thanks for your initial feedback. \ExchangeMitigations.ps1 -WebSiteNames "Default Web Site" -RollbackECPAppPoolMitigation -RollbackOABAppPoolMitigation Thanks in advance for your responses and recommendations.

\ExchangeMitigations.ps1 -WebSiteNames "Default Web Site" -RollbackAllMitigation or b) for specific rollbacks. My question is - can I now rollback the above mitigations.put in place by the EchangeMitigations.ps1 script, or will I be leaving the system vulnerable? Rollback would be done via the following a) For rollback of all mitigations: via Exchange Powershell. The script only said the server was Up, and did not report any vulnerabilities. The ExchangeMitigiations.ps1 script included the following mitigations: Backend Cookie Mitigation Unified Messaging Mitigation ECP Application Pool Mitigation OAB Application Pool Mitigation Also, after applying the CU23 upgrade and security patch, I used the Nmap Script To scan for CVE-2021-26855 from a remote PC, using the Exchange server's public IP. Prior to performing the upgrade and patch, I ran the following mitigation script: ExchangeMitigations.ps1, which is designed to address the following vulnerabilities:

Greetings, I have upgraded an Exchange 2013 server to CU23 and installed the MS security patch.